<html>
<head>
<style>
.normal {font-weight:normal;}
.light {font-weight:lighter;}
.thick {font-weight:bold;}
.thicker {font-weight:700;}
</style>
</head>

<body>
<ul>
<li class="thick">Coffee</li>
<li>Tea</li>
<li class="thicker">Coca Cola</li>
</ul>
</body>

</html>